George r



ttd giant @time til iw.

Letters Patent No. 100,056, datedJ February 22, 1870.

" iaanmvce suns-VALVE.

The Schedule referred to in these Lettera Patent and making part of the same lhe object of my invention is to provide a counter' balance or relief to the usual pressure and consequent friction of slide and other valves upon their seats when working under steam or liquid pressure.

I placea friction-roller centrally upon the back ofthe valve and just enough above it to allow a bar or lever to pass between them, and this lever I suspend by two links on twoother levers which are pivoted, each at one end, to the steam-chest, on opposite sides thereof; while the two ends coming together are left to bear freely of each other in an adjustable looped hanger at the centerof'the steam-chest where it passes through an elastic plate, and thus combines the action of the elastic plate with the levers, so that they shall bring a pressure upon the friction-roller in the direction opposite to the valve-seat, and thus by all the tendency there is from the pressure of the steam upon the inside elastioplate or top of the steam-chest to lift it upward, the valve it relieved from downward pressure upon its seat.

Figure l is a longitudinal section of\an ordinary steam-chest and slide-valve with my improvement ineluded.

Figure 2 is a plan view of the upper levers.

Figure-3 is a plan view of the adjustable hanger, which operates from its central position, all the levers alike-effecting the valve.

There are three levers in all, a b c.

The lower one, a, extends wholly across the steamchest so as not to be swayed by the altern-ations or reverse motions'of the valve.

This level' is wholly suspended upon the .other two b and c, by the links l l. l

b ando are loosely dovetailed into each other and are both sustained upon the same level in the adjustable hanger d, which passes centrally through the top 0f the steam-chest or elastic plate e.

All the levers are hung so that an unvarying pressure is conveyed from the friction-roller f to the hanger d, irrespective of the position of f upon e.

I- claim as my invention- The combination of the valve with the elastic plat or its equivalent, by means of the balancing levers a b c, substantially as and for the purpose herein set forth i GEO. R. MOORE.

Witnesses:

SAML. l?. JONEs, Jr., M. V. DONNELLY. 

